thanks for query,
this is not bad infection and all. sore, swollen, pus around your piercing is due to infection around that piercing area...you need to get treated by your near by physician..he will drain the pus and he will prescribe antibiotic to overcome infection. it will be cured in 7-10days ...acne is due to hormonal
imbalance and later on it turned into bacterial infection...you need to take anti-acne antibiotic cream to overcome that..if it is severe acne
you need to take tablet also...
post me for further more queries....please accept this answer if you feel satisfied...